/**************************************************************************** * net/uip/uip-icmpinput.c * Handling incoming ICMP/ICMP6 input * * Copyright (C) 2007 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * Adapted for NuttX from logic in uIP which also has a BSD-like license: * * Original author Adam Dunkels * Copyright () 2001-2003, Adam Dunkels. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote * products derived from this software without specific prior * written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #ifdef CONFIG_NET #include #include #include #include #include #include "uip-internal.h" /**************************************************************************** * Definitions ****************************************************************************/ #define ICMPBUF ((struct uip_icmpip_hdr *)&dev->d_buf[UIP_LLH_LEN]) /**************************************************************************** * Public Variables ****************************************************************************/ /**************************************************************************** * Private Variables ****************************************************************************/ /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: uip_icmpinput * * Description: * Handle incoming ICMP/ICMP6 input * * Parameters: * dev - The device driver structure containing the received ICMP/ICMP6 * packet * * Return: * None * * Assumptions: * Called from the interrupt level or with interrupts disabled. * ****************************************************************************/ void uip_icmpinput(struct uip_driver_s *dev) { #ifdef CONFIG_NET_STATISTICS uip_stat.icmp.recv++; #endif #ifndef CONFIG_NET_IPv6 /* ICMPv4 processing code follows. */ /* ICMP echo (i.e., ping) processing. This is simple, we only change the * ICMP type from ECHO to ECHO_REPLY and adjust the ICMP checksum before * we return the packet. */ if (ICMPBUF->type != ICMP_ECHO) { uip_log("icmp: not ICMP echo."); goto typeerr; } /* If we are configured to use ping IP address assignment, we use * the destination IP address of this ping packet and assign it to * ourself. */ #if UIP_PINGADDRCONF if (dev->d_ipaddr == 0) { dev->d_ipaddr = ICMPBUF->destipaddr; } #endif /* UIP_PINGADDRCONF */ ICMPBUF->type = ICMP_ECHO_REPLY; if (ICMPBUF->icmpchksum >= HTONS(0xffff - (ICMP_ECHO << 8))) { ICMPBUF->icmpchksum += HTONS(ICMP_ECHO << 8) + 1; } else { ICMPBUF->icmpchksum += HTONS(ICMP_ECHO << 8); } /* Swap IP addresses. */ uiphdr_ipaddr_copy(ICMPBUF->destipaddr, ICMPBUF->srcipaddr); uiphdr_ipaddr_copy(ICMPBUF->srcipaddr, &dev->d_ipaddr); vdbg("Outgoing ICMP packet length: %d (%d)\n", dev->d_len, (ICMPBUF->len[0] << 8) | ICMPBUF->len[1]); #ifdef CONFIG_NET_STATISTICS uip_stat.icmp.sent++; uip_stat.ip.sent++; #endif return; typeerr: #ifdef CONFIG_NET_STATISTICS uip_stat.icmp.typeerr++; uip_stat.icmp.drop++; #endif dev->d_len = 0; #else /* !CONFIG_NET_IPv6 */ /* If we get a neighbor solicitation for our address we should send * a neighbor advertisement message back. */ if (ICMPBUF->type == ICMP6_NEIGHBOR_SOLICITATION) { if (uip_ipaddr_cmp(ICMPBUF->icmp6data, dev->d_ipaddr)) { if (ICMPBUF->options[0] == ICMP6_OPTION_SOURCE_LINK_ADDRESS) { /* Save the sender's address in our neighbor list. */ uiphdr_neighbor_add(ICMPBUF->srcipaddr, &(ICMPBUF->options[2])); } /* We should now send a neighbor advertisement back to where the * neighbor solicication came from. */ ICMPBUF->type = ICMP6_NEIGHBOR_ADVERTISEMENT; ICMPBUF->flags = ICMP6_FLAG_S; /* Solicited flag. */ ICMPBUF->reserved1 = ICMPBUF->reserved2 = ICMPBUF->reserved3 = 0; uiphdr_ipaddr_copy(ICMPBUF->destipaddr, ICMPBUF->srcipaddr); uiphdr_ipaddr_copy(ICMPBUF->srcipaddr, dev->d_ipaddr); ICMPBUF->options[0] = ICMP6_OPTION_TARGET_LINK_ADDRESS; ICMPBUF->options[1] = 1; /* Options length, 1 = 8 bytes. */ memcpy(&(ICMPBUF->options[2]), &dev->d_mac, IFHWADDRLEN); ICMPBUF->icmpchksum = 0; ICMPBUF->icmpchksum = ~uip_icmp6chksum(dev); } else { goto drop; } } else if (ICMPBUF->type == ICMP6_ECHO) { /* ICMP echo (i.e., ping) processing. This is simple, we only * change the ICMP type from ECHO to ECHO_REPLY and update the * ICMP checksum before we return the packet. */ ICMPBUF->type = ICMP6_ECHO_REPLY; uiphdr_ipaddr_copy(ICMPBUF->destipaddr, ICMPBUF->srcipaddr); uiphdr_ipaddr_copy(ICMPBUF->srcipaddr, dev->d_ipaddr); ICMPBUF->icmpchksum = 0; ICMPBUF->icmpchksum = ~uip_icmp6chksum(dev); } else { uip_log("icmp: unknown ICMP6 message."); goto typeerr; } vdbg("Outgoing ICMP6 packet length: %d (%d)\n", dev->d_len, (ICMPBUF->len[0] << 8) | ICMPBUF->len[1]); #ifdef CONFIG_NET_STATISTICS uip_stat.icmp.sent++; uip_stat.ip.sent++; #endif return; typeerr: #ifdef CONFIG_NET_STATISTICS uip_stat.icmp.typeerr++; #endif drop: #ifdef CONFIG_NET_STATISTICS uip_stat.icmp.drop++; #endif dev->d_len = 0; #endif /* !CONFIG_NET_IPv6 */ } #endif /* CONFIG_NET */